**Not sure if this is intended or not but decided to post anyways**
When there is a torch(or any other non solid block that can do the same) placed on the same block as an item frame, the item frame(when an item is in it) doesn't output to a comparator like it does without the torch there

What I try to do: place a torch on the same block as an item frame to disguise the item in it so i can make a secret combo door

What Happens: It doesn't output the redstone signal

Steps to recreate:
1.Place an item frame on a block
2. put a comparator on the back of the blockwith input side facing the block
3.place an item in frame and observe the redstone signal outputted
4.place a torch on the block that the item frame is on NOT IN THE FRAME
5.update the frame by turning the item or removing it and placing it back in
6.observe the fact there is no longer a signal